public void SetupForEvolution(Population the_population, FitnessDirection fd )
{
this.direction = fd;
this.CurrentGeneration = new Generation(0);
this.CurrentGeneration.population = the_population ;
if ( this.CurrentGeneration.population.IsEmpty )
{
throw new GeneticError("Cannot start with empty population");
}
}
public Environment( )
{
this.CurrentGeneration = null;
}
public void MakeNextGenerationThroughCrossover()
{
Generation next_generation = new Generation( Environment.generation_id_generator.GetUniqueID() );
next_generation.population = new Population( this.CurrentGeneration.population.Capacity );
Organism best_organism = this.FindBestOrganismInPopulation( this.CurrentGeneration.population );
next_generation.population.AddOrganism( best_organism );
while (!next_generation.population.IsFull)
{
geneticfx.Population offspring_population = new geneticfx.Population( this.CurrentGeneration.population.Capacity );
Organism parent0 = this.SelectForCrossover();
bool perform_crossover = Environment.rand.NextDouble() < this. CrossoverRate;
if ( perform_crossover )
{
Organism parent1 = this.SelectForCrossover();
Organism child0;
Organism child1;
this.Crossover( parent0, parent1, out child0, out child1);
child0.GenerationID = next_generation.ID;
offspring_population.AddOrganism(child0);
child1.GenerationID = next_generation.ID;
offspring_population.AddOrganism(child1);
}
else
{
offspring_population.AddOrganism( parent0 );
}
for (int i=0;i<offspring_population.Size;i++)
{
if (next_generation.population.IsFull)
{
break;
}
Organism child = offspring_population[ i ];
for (int gi=0;gi<child.Genes.GetLength();gi++)
{
bool perform_mutation = Environment.rand.NextDouble() < this.MutationRate ;
if ( perform_mutation )
{
child.Genes.MutateGene(gi);
}
}
child.Fitness = child.Genes.CalculateFitness();
next_generation.population.AddOrganism( child );
}
}
if ( this.CurrentGeneration.population.Size != next_generation.population.Size )
{
throw new GeneticError("Population sizes do not match");
}
this.CurrentGeneration = next_generation;
}
